Electric battery.



quired to furnish larger EE Ta ras ER'WIN AGH'EI'IBRCH, HAMBU'IRG, GERMANY.

' No Drawing.

To all whom it may concern.

Be it known. that I, ERWIN frcnmrnaoina subject of the, German Emperor, and residing at Hamburg, in Germany, have invented new and useful Improvements in Electric Batteries, of which the following is a speci tion.

lily invention relates to electric batteries, and consists in certain improvements, hereinafter specifiethlin'the formation of primary gali'anic cellslof the manganese-porous bag type, by which their capacity is notably increased. These manganese-porous bag cells give good results when only small currents oi, for example, 0.1 to 0.3 ampere are taken therefrom, but fail quickly when recurrents of, for example, O/l'to l ampere. In. this case the fall of potential is so rapid, that only 7;, at the most, of the normal capacity is obtained.

The reason for this fall in potential, Whichoccurs even under short periods of load of about 0.3 ampere, hes in the poor conductivity oi the manganese dioxid, which can',

indeed, be improved by the addition of graphite, but not to,su cla an extent, however, as to permit of high loads, which necessitate a rapid emission of oxygen from the manganese dioxid. 1. According to the present invention, mercuric oxid, preferably the red oxid (HgO),

'- is added to the manganese-graphite mass,

-"wl ereby the manganese dioxid inthe galvanic cell is caused to give off its oxygen much more rapidly when the circuit is closed (during electrolysis). With this addition, the potential under continued load 1s considerably increased, and the capacity is itself materially greater under steady demands on. the cell,amounting indeed to several timesthat of theordinary manganese-porous bag cells, especially when an alkaline electrolyte, for example, potash or soda lye, is used.

With such an electrolyte, a manganese superoxid cell, with addition of mercuric and, I9 capable of delivernng heavy current with great capacity. \Vith my construction oi I Specification of Letters be proved that, neither a purely 1 .the latter consisting-of a depolarizing mixmercuric oxid.

Patented June Application filed February 6, 1913. Serial 7 35.637.

cell; the additionof mercuric oxicl seems to causethe manganese super to more readily give oil its oxygen during the discharging: also to improve the conductivity of the manganesefsuper oxid electrode, whereby the internal resistance of such' a cell finished and itspotential and capacity are, at the same ti1ne,,considerahly increased Although man i curic oxid cells are'old,,ye' a first to discover .the iraluable pi combination manganese oxid, with other electrode and -with an alkaline electrc a mercuric of zinc ll; 'car anganese cell nor a'purely mercuric oxid cell is capable of the output, measured byl l atchour capacity per unit of Weight, of which my combination, manganese mercuric osnl, and zinc electrodes in an alkaline electrolyte, is capable,

Having thus described my invention, what l. claim is 1. A galvanic primary cell comprising an anode, an alkaline electrolyte, and a cathode,

ture of graphite, manganese dioxid, and

Eli-WIN ACHEN ACH. Witnesses ERNEST H. L. MoMMnNriorr, in Cimisr. HAFERMANN. 

